juko | fe2da6f6741868925d0ad9edebc6879c10966003280506915d9a336bc11bd015

General

Target
2026-05-16_65cf3e59dc1f692891a38ac01790d2a9_elex_wannacry.exe
Size 49KB
Sample260516-jdsepsey4j
SHA256 fe2da6f6741868925d0ad9edebc6879c10966003280506915d9a336bc11bd015
MD5 65cf3e59dc1f692891a38ac01790d2a9
SHA1 05830c884dbbed0ffa9c0daf0c221fab56205a23
SHA512 ac65439146dbf711ccf6776f6a998fc6bf850959e5bffc12bff8dc28721ab67d5fe3b1120bbcc74f392a1eb716098239c6eb0cf16067e2f680520c1dbc2d3286
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2N:VLy2Kerc64CiGImVucp4kojWh2N
TLSH
T10A334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

discovery juko persistence trojan

Malware Config

Signatures

Family: Juko
Juko is a trojan written in C++.
trojan juko

Detects Juko 7 IoCs

resource	yara_rule
behavioral2/memory/5212-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x001e00000002b282-5.dat	family_juko
behavioral2/memory/5212-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/2176-14-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x002400000002b39f-15.dat	family_juko
behavioral2/memory/4112-17-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/4112-18-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
2176	WINWORD.exe
4112	WINWORD.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-2043432456-1617298091-2772621413-1000\Software\Microsoft\Windows\CurrentVersion\Run\WINWORD = "C:\\Users\\Admin\\AppData\\Roaming\\Mozilla\\WINWORD.exe -r"	WINWORD.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

System Location Discovery: System Language Discovery 1 TTPs 7 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-05-16_65cf3e59dc1f692891a38ac01790d2a9_elex_wannacry.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	PING.EXE

System Network Configuration Discovery: Internet Connection Discovery 1 TTPs 4 IoCs

Adversaries may check for Internet connectivity on compromised systems.

discovery

Internet Connection Discovery

T1016.001

pid	Process
4772	cmd.exe
4648	PING.EXE
4516	PING.EXE
1840	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4648	PING.EXE
4516	PING.EXE
1840	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5212 wrote to memory of 2176	5212	2026-05-16_65cf3e59dc1f692891a38ac01790d2a9_elex_wannacry.exe	80
PID 2176 wrote to memory of 4772	2176	WINWORD.exe	81
PID 4772 wrote to memory of 4648	4772	cmd.exe	83
PID 4772 wrote to memory of 4516	4772	cmd.exe	84
PID 4772 wrote to memory of 1840	4772	cmd.exe	85
PID 4772 wrote to memory of 4112	4772	cmd.exe	86

C:\Users\Admin\AppData\Local\Temp\2026-05-16_65cf3e59dc1f692891a38ac01790d2a9_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-16_65cf3e59dc1f692891a38ac01790d2a9_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5212
- C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
  "C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" -r
  2⤵
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2176
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\System32\cmd.exe" /c ping 127.0.0.1 -n 2&del "C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe"&ping 127.0.0.1 -n 2&rename "C:\Users\Admin\AppData\Roaming\Mozilla\000036CF" WINWORD.exe&ping 127.0.0.1 -n 2&"C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" \r
    3⤵
    - System Location Discovery: System Language Discovery
    - System Network Configuration Discovery: Internet Connection Discovery
    - Suspicious use of WriteProcessMemory
    PID:4772
  - - C:\Windows\SysWOW64\PING.EXE
      ping 127.0.0.1 -n 2
      4⤵
      System Location Discovery: System Language Discovery
      System Network Configuration Discovery: Internet Connection Discovery
      Runs ping.exe
      PID:4648
  - - C:\Windows\SysWOW64\PING.EXE
      ping 127.0.0.1 -n 2
      4⤵
      System Location Discovery: System Language Discovery
      System Network Configuration Discovery: Internet Connection Discovery
      Runs ping.exe
      PID:4516
  - - C:\Windows\SysWOW64\PING.EXE
      ping 127.0.0.1 -n 2
      4⤵
      System Location Discovery: System Language Discovery
      System Network Configuration Discovery: Internet Connection Discovery
      Runs ping.exe
      PID:1840
  - - C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
      "C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" \r
      4⤵
      Executes dropped EXE
      Adds Run key to start application
      System Location Discovery: System Language Discovery
      PID:4112

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Remote System Discovery

1

T1018

System Information Discovery

1

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

System Network Configuration Discovery

1

T1016

Internet Connection Discovery

1

T1016.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

000036CF

Path C:\Users\Admin\AppData\Roaming\Mozilla\000036CF
Size 49KB
SHA256 356deb041e064fa78aa81e4b863c172f5c747ee2bc8d2e4dd4e3cee266f55c0c
MD5 a6bfa90bd4f651aae585ab438ffb698e
SHA1 75c4620359cb4c72a913b01f54d1bc31bdecb081
SHA512 56ee5d4250117340dcbeb5c05248a399e237beb88fe2960771c4d17116d979bb8877dd8223681609d90a51f203a10a94bf4b2b44c50057f575e2fad999190432
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2u:VLy2Kerc64CiGImVucp4kojWh2u
TLSH
T1C5334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 49KB
SHA256 fe2da6f6741868925d0ad9edebc6879c10966003280506915d9a336bc11bd015
MD5 65cf3e59dc1f692891a38ac01790d2a9
SHA1 05830c884dbbed0ffa9c0daf0c221fab56205a23
SHA512 ac65439146dbf711ccf6776f6a998fc6bf850959e5bffc12bff8dc28721ab67d5fe3b1120bbcc74f392a1eb716098239c6eb0cf16067e2f680520c1dbc2d3286
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2N:VLy2Kerc64CiGImVucp4kojWh2N
TLSH
T10A334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2176-14-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4112-17-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4112-18-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/5212-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/5212-12-0x0000000000400000-0x0000000000420000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads